Cross drilling, milling and slotting attachment for multiple spindle screw machines



V. J. COLLIN June 23, 1964 FOR MULTIPLE SPINDLE SCREW MACHINES 5Sheets-Sheet 1 Filed Dec. l5, 1962 INVENTOR. l/Ff/ ERE d'. COLL/N WHW?FI'TTORNEY June 23, 1964 v. .1. COLLIN 3,138,042

@Ross DRTLLTNG, MILLING AND sLoTTTNG ATTACHMENT FOR MULTIPLE SPINDLESCREW MACHINES Filed Dec. l5, 1962 5 Sheets-Sheet 2 w i' my.

Wlllllllllllllllllll FITTORNEY V. J. COLLIN CROSS DRILLING, MILLING ANDSLOTTING ATTACHMEN FOR MULTIPLE SPINDLE SCREW MACHINES Filed Deo. 13,1962 5 Sheets-Sheet 3 INVENTOR. I/F/LERE J. COLL/N mum",

HTTOR/YEY v. J. COLLIN 3,138,042 cRoss DRTLLING, MILLING AND sLoTTTNGATTACHMENT June 23, 1964 FOR MULTIPLE SPINDLE SCREW MACHINES 5Sheets-Sheet 4 Filed Dec. l5, 1962 36 4/2 INVENTOR l/FILERE J.' COLL/Nm4n/91M? 53k 72%@ I i HTTORNEY V. J. COLLIN June 23, 1964 CROSSDRILLING, MILLING AND SLOTTING ATTACHMEN FOR MULTIPLE SPINDLE SCREWMACHINES 5 Sheets-Sheet 5 Filed Deo. 13, 1962 INVENTOR. VF/LERE J.COLL/N HTTORNEY United States Patent 3,138,042 CROSS DRILLING, MILLINGAND SLOTTING AT- TACHMENT FOR MULTIPLE SPINDLE SCREW MACHINES Valere II.Collin, Waterbury, Conn. (47 Wilson Road, Wolcott, Conn.) Filed Dec. 13,1962, Ser. No. 244,351 3 Claims. (Cl. 77-26) This invention relates toscrew machines, and more particularly to a milling or slottingattachment for an automatic multiple spindle screw machine.

One object of the present invention is to provide an attachment of theabove nature, which will be relatively simple in construction,inexpensive to manufacture, easy to install and manipulate, compact,ornamental in appearance, and very efficient and durable in use.

With these and other objects in View, there has been illustrated on theaccompanying drawings, one form in which the invention may convenientlybe embodied in practice.

In the drawings:

FIG. 1 illustrates a cross-sectional view in elevation of an automaticDavenport Screw Machine, in which the present invention has beeninstalled.

FIG. 2 is a fragmentary end view of the same, taken from the line 2-2 ofFIG. 1, showing the yoke for feeding the cam sleeve which operates thecross spindles.

FIG. 3 is a fragmentary longitudinal sectional view, taken along theline 3-3 of FIG. 2.

FIG. 4 is a cross sectional view of the cross spindle housing, takenalong the line 4-4 of FIG. 3.

FIG. 5 is a cross-sectional View, taken along the line 5-5 of FIG. 4,showing the pivot pins for the cam arms, and the bearings for the crossdrill spindles.

FIG. 6 is an end sectional view of the cam feed yoke and the cross drilloperating mechanism, taken along the line 6-6 of FIG. 5.

FIG. 7 is a cross-sectional view, taken along the line 7--7 of FIG. 6,showing two of the opposite cam arms at the start of the feed of thecross drills.

FIG. 8 is a similar cross-sectional View, showing the other two oppositecam arms at the end of their feed.

FIG. 9 is a similar cross-sectional view of the rst two operating camarms shown in FIG. 7, one of which is in feeding position and the otheris released.

FIG. 10 is a cross-sectional view, similar to FIG. 8, of the other twoopposed cam arms at the end of the feed, one drill being released andthe other drilling a hole in the work piece.

FIG. l1 is a schematic view similar to FIG. 7, of the cross drillmechanism showing one of the cam arms in operating position for drivinga drill inwardly, and the opposite ca m arm in released position.

FIG. l2 is a similar schematic view, showing both of the cam arms inreleased positions.

FIG. 13 is a similar schematic view of the opposed cam arms, with one ofthe cross drills shown in the process of clearing out the hole, and theother cross drill in released position. v

FIG. 14 is a schematic View showing all four of the drills operatingsimultaneously to produce four recesses in a solid rod.

FIG. 15 is a schematic view of the same, in which one of said drills isin position for clearing out the hole, and two of the drills are idle.

FIG. 16 is a schematic view of the same, with three of the cross drillsidle and the fourth cross drill in position for clearing out the hole inthe work piece.

Referring now to the drawings, in which like reference numerals denotecorresponding parts throughout the several views, the numeral 20indicates the base casting of 3,138,042 Patented June 23, 1964 FPlee astandard multiple spindle Davenport Screw Machine, having upstandingfront and rear arms 21 and 22 for supporting a horizontal central driveshaft 23, said shaft having a drive gear 24 rigidly mounted thereon, asby a set screw 24a.

The numeral 25 indicates a gear secured to a horizontal driven shaft 26by means of a set screw 25a. The driven shaft 26 is mounted inantifriction bearings 27, 28 and the center drive shaft 23 is mounted insimilar bearings 29, 30, as clearly shown in FIG. l of the drawing.

Provision is also made of a pair of upstanding brackets 31 and 32, whichare rigidly mounted on the tops of the front and rear arms 21, 22,respectively.

The numeral 33 indicates a vertical yoke of semicircular construction,which is secured by means of a set screw 34 on a horizontal yokeoperating rod 35, smaller than and parallel to the shafts 23 and 26. Theyoke 33 is provided with a pair of curved depending side saddle arms 36,37, which are located in a circular slot 38 formed in a cylindricalsleeve 39, as shown in FIGS. 1 and 2 of the drawing.

The numerals 40, 41, 42, 43, indicate four cross spindles mounted in ahousing at right angles to each other, said spindles being surrounded byanged antifriction bearings 46a, 41a, 42a, 43a. The cross spindles 40,41, 42, 43 have threaded inner ends, on which are mounted four cuttingtools 44, 45, 46, 47.

In order to adjust the longitudinal position of the yoke operating rod35, provision is made of a pair of turn buckles 48, 49, as clearly shownin FIG. 1 of the drawing.

The numeral 50 indicates generally a cam feed block mounted in bracketssecured to the base casting 20.

The turn buckle 48 comprises a pair of right-hand and left-hand endthreaded sections 51, 52, the latter being joined to a connector block53, by a pin 53a. The turn buckle 49 similarly comprises right-hand andleft-hand threaded sections 54, 55, the latter being connected to atapped connector block 56 by a pin 56a.

`The numeral 57 (FIG. 1) indicates a special yoke feed plate cam, andthe numeral 58 indicates a vertical block which is secured rigidly to astationary rod 63 located within the horizontal shaft 26.

Provision is also made of a horizontal stud bolt 59 having a threadedend 60 screwed into a tapped cavity 61 in the rear vertical arm 22.

The numeral 62 (FIGS. 3 and 6) indicates a hollow gear secured to thestationary rod 63 located within the interior of the driven shaft 26.The gear 62 is held rigidly in position by a lock nut 64, as clearlyshown in FIGS. 3 and 6 of the drawing, and said gear is provided with akeyway 65 (FIG. 3) for receiving a key 66 located upon the rod 63.

Provision is also made of a heX nut 67 at the opposite end of the rod63, which engages a washer 68 and has a key 68a and a keyway 68h forholding this end of said rod rmly in the block 58. Provision is alsomade of a pair of bronze bushings 69, 70, located at the opposite endsof the rod 63 and fitted within the hollow spindle 26.

In order to simultaneously rotate the spindles 40, 41, 42, 43 and thetools 44, 45, 46, 47 of the cross drill mechanism, provision is made offour drill gears 71, 72, 73, 74 (FIG. 4) each of which is adapted tomesh with the gear 62 previously mentioned, and are located within thecylin- .drical housing 75.

Located within the spindle housing 75 are four spools 76, 77, 78, 79which are mounted to move in and out within the spindle housing 75 andare connected rigidly as by lock screws 80, 81, S2, 83 (FIG. 4) to saidcross spindles 40, 41, 42, 43 respectively.

The cross drills 44, 45, 46, 47 are adapted to be operated automaticallyby means of four cam arms 84, 85, 86, 87 (FIGS. 3, 4, 7, 8, 9 and 10),each of which are pivot- "9 ally mounted on short horizontal bearingpins 38 (FIGS. and 6) within a cylindrical rear housing 94. Each of thebearing pins 88 are provided with a threaded end 88a and an enlargedhead 88h, as clearly shown in FIG. 5.

Each of the cam arms 84, 85, 86, 87 is provided with a fork 39 embracinga paii of small needle bearings 9G (FIG. 5), located within the interiorof the spools 76, 77, 78, 79, respectively. The bearings 90 are mountedupon cross pins 91 secured in the forks 89 of the cam arms 84, 85, 86and 87.

The heads 8811 of the bearing pins 88 are located in cylindricalclearance cavities 92 (FIG. 5). The cam arms S4, 85, S6, 87 are pressedoutwardly by means of four small coil springs 93 (FIG. 6), located inrecesses in said cam arms and the rear support 94. Provision is alsomade of four horizontal screws 9S which serve to secure the rear support94, to the spindle housing 75.

Operation In the operation of the improved cross drill attachment hereindisclosed, the horizontal spindle 26 will be driven by the gears 24 and25 and caused to rotate the spindle housing 75 around the work W coaxialtherewith, said work being rotated at the same speed. All four of thecross spindles 40, 41, 42, 43, will thus be revolved about the worksimultaneously, and will be moved inwardly by the cam arms S4, 85, S6,87 to carry the cutting tools 44, 45, 46, 47 inwardly into the work W.

The sleeve 39 which is embraced by the saddle arms 36, 37 of the yoke 33will engage all of the cam arms 84, 85, 85, S7 simultaneously, thusforcing the cross spindles 40, 41, 42, 43 and the cutting tools 44, 45,46, 47 against the work W. If desired, four recesses may be drilledsimultaneously (FIG. 14) in the outer surface of a solid rod, or anyselected one of the cutting tools may be forced entirely through thework piece to clean it out (FIGS. 15, 16).

While the screw machine attachment is herein illustrated for use withcross drills, it will be understood that milling and slotting tools mayalso be attached to the cross spindles within the spirit and scope ofthe invention.

While there has been disclosed in this specification one form in whichthe invention may be embodied, it is to be understood that this form isshown for the purpose of illustration only, and that the invention isnot limited to the specific disclosure, but may be modified and embodiedin various other equivalent forms without departing from its spirit. Inshort, the invention includes all the modifications and embodimentscoming within the scope of the following claims.

Having thus fully described the invention, what is claimed as new andfor which it is desired to secure Letters Patent is:

l. In a cross drill attachment for a multiple spindle screw machine, abase having a pair of upstandng front and rear bearing arms forsupporting a horizontal main drive shaft and a hollow driven shaftparallel with said main shaft, a drive gear fixed on said main shaft, adriven gear fixed on said driven shaft and meshing with said drive gear,a cylindrical sleeve mounted on the outer end of said driven shaft andhaving a circular slot on the pcriphery thereof, a forked yoke having apair of curved saddle arms located in said slot, a horizontal cam drivenrod located above said driven shaft and fixed to said yoke for advancing'said sleeve, a housing connected to said driven shaft located adjacentsaid sleeve and having four equally spaced radial cross spindles locatedtherein, each of said cross spindles carrying a cutting tool on itsinner end and having a pinion intermediate its ends, a hollow circulargear meshing with each of said pinions to rotate said cutting toolssimultaneously, said hollow gear being secured to the end of ahorizontal rod fixed within said hollow driven shaft, each of said crossspindles having a spool secured thereto near its outer end for rotationtherewith, said sleeve cylindrical having four interior cam surfaces,four spring pressed cam arms pivotally mounted in a support connected tosaid housing, and having lugs thereon for engaging said cam surfaces theouter ends of said cam arms being forked and provided with inwardlyextending pins fitted within the opposed sides of said spools, whereby ahorizontal rotating work piece located coaxially within the center ofsaid spindles may be operated upon simultaneously by said four cuttingtools.

2. The invention as defined in claim l, in which cam means is providedon said base in alignment with said yoke rod to drive the latterforwardly and cause said cutting tools to engage said work piece.

3. The invention as defined in claim 2, in which a horizontal stud isfixed to the rear arm of said base and a vertical block on said baselocated in abutment with a nut fixed on the end of the horizontal rod insaid hollow driven shaft.

References Cited in the file of this patent UNITED STATES PATENTS739,501 Meyers Sept. 22, 1903 2,467,399 Moyer Apr. 19, 1949 FOREIGNPATENTS 354,386 Great Britain Aug. 10, 1931

1. IN A CROSS DRILL ATTACHMENT FOR A MULTIPLE SPINDLE SCREW MACHINE, ABASE HAVING A PAIR OF UPSTANDING FRONT AND REAR BEARING ARMS FORSUPPORTING A HORIZONTAL MAIN DRIVE SHAFT AND A HOLLOW DRIVEN SHAFTPARALLEL WITH SAID MAIN SHAFT, A DRIVE GEAR FIXED ON SAID MAIN SHAFT, ADRIVEN GEAR FIXED ON SAID DRIVEN SHAFT AND MESHING WITH SAID DRIVE GEAR,A CYLINDRICAL SLEEVE MOUNTED ON THE OUTER END OF SAID DRIVEN SHAFT ANDHAVING A CIRCULAR SLOT ON THE PERIPHERY THEREOF, A FORKED YOKE HAVING APAIR OF CURVED SADDLE ARMS LOCATED IN SAID SLOT, A HORIZONTAL CAM DRIVENROD LOCATED ABOVE SAID DRIVEN SHAFT AND FIXED TO SAID YOKE FOR ADVANCINGSAID SLEEVE, A HOUSING CONNECTED TO SAID DRIVEN SHAFT LOCATED ADJACENTSAID SLEEVE AND HAVING FOUR EQUALLY SPACED RADIAL CROSS SPINDLES LOCATEDTHEREIN, EACH OF SAID CROSS SPINDLES CARRYING A CUTTING TOOL ON ITSINNER END AND HAVING A PINION INTERMEDIATE ITS ENDS, A HOLLOW CIRCULARGEAR MESHING WITH EACH OF SAID PINIONS TO ROTATE SAID CUTTING TOOLSSIMULTANEOUSLY, SAID HOLLOW GEAR BEING SECURED TO THE END OF AHORIZONTAL ROD FIXED WITHIN SAID HOLLOW DRIVEN SHAFT, EACH OF SAID CROSSSPINDLES HAVING A SPOOL SECURED THERETO NEAR ITS OUTER END FOR ROTATIONTHEREWITH, SAID SLEEVE CYLINDRICAL HAVING FOUR INTERIOR CAM SURFACES,FOUR SPRING PRESSED CAM ARMS PIVOTALLY MOUNTED IN A SUPPORT CONNECTED TOSAID HOUSING, AND HAVING LUGS THEREON FOR ENGAGING SAID CAM SURFACES THEOUTER ENDS OF SAID CAM ARMS BEING FORKED AND PROVIDED WITH INWARDLYEXTENDING PINS FITTED WITHIN THE OPPOSED SIDES OF SAID SPOOLS, WHEREBY AHORIZONTAL ROTATING WORK PIECE LOCATED COAXIALLY WITHIN THE CENTER OFSAID SPINDLES MAY BE OPERATED UPON SIMULTANEOUSLY BY SAID FOUR CUTTINGTOOLS.